Digital BW, The Print

I was printing out a stepwedge tonight and it suddenly hit me that I don't know what 
difference there'd be between printing the untagged file with No Color Management and 
printing it with Let Printer Determine Colors.  Does it make any difference which way you 
print the test file if you're using the ABW function of the Epson driver?  Seems to me it 
shouldn't.

Ed